Traditional Meanings:

European (Judeo-Christian)

• Warning if security (finance) – In general dreaming of securities (finance: banknotes, stocks, shares, bonds, futures and other), so it is a warning against speculation;
• Losses if buy security or securities – In the dream you buy security then this this indicates financial losses or money spending for unnecessary things;
• Saved dreamer if lose securities – The dreamer is saved from an imminent failure or other loss of money if he loses securities in the dream.

* Please, see meaning of shares.